Malicious PDF — malware analysis report

Static analysis result for SHA-256 529280b6b0c911a6…

MALICIOUS

PDF

79.5 KB Created: 2021-06-26 18:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f302440f588d5b4f64b5579ed7fb57d8 SHA-1: b6ceaeeef519a87dca178ed214365fb3374f388e SHA-256: 529280b6b0c911a60c9a47553ad5c6ae219cd9a9e65e0509ee42c92ebd37ccc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites that host further PDF files. This suggests a multi-stage attack, likely for phishing or distributing additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7bfd9ea9e---13541091507.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a0c2badb9---93490548643.pdf
    • http://elementsgogreen.com/userfiles/file/supoteraguzibix.pdf
    • https://aquaprosmart.com/userfiles/files/tixili.pdf
    • http://bociany.sk/media/file/83424708745.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ld28md0crvcf7rhod6r9sefbvj/wusanubejuvodepesado.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fd9a37faa---59334251540.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea76b9e5d1---34602167828.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/5ptbupkbj5s3hanrcofd0vtf3q/rebuxemiv.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68ccbfc53---tatibumaxipez.pdf
    • http://boothbayharborshipyard.com/userfiles/file/86756876499.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/2eaab4dcc94a480442c71474d96852fb/46657221888.pdf
    • https://www.tunnel.de/files/uploaded/file/kowolojeripibomow.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf94920f3---44412061994.pdf
    • http://mondoacquapiscine.com/userfiles/files/43134265459.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e5f1c1fe1---50777890504.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d077e27fba---57701579052.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/up4pe2dcmfo25u1duf3ku3d1l0/47013808382.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b112c4203---6540530376.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/714250d1ba345c314889c2ebf036bf4a/nubug.pdf
    • http://afghansolar.com/userfiles/file/63049979801.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e3dbc6ee9---tatoputuvuzabixobedazad.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072560f6e02c---tejupudator.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ce7c62491cf9facba58810a678dc9ba7/16391922929.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4d55c1f65---dutunam.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=my+favourite+pet+is
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d64d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 16792 bytes
font_01_sfnt_off0000ee5f.bin
e1d3566b823c8b909963d6fdddba08c1d4f10d57c7d1b93401d50bcf7e892f5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 16448 bytes
font_02_sfnt_off000118e0.bin
a3e15f549c1df6b51e7b1bd038c7df16180d68e9fd9ea81b02a415cc7934e159
pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 10472 bytes